Is there a LastIndexOf in SQL Server?

I am trying to parse out a value from a string that involves getting the last index of a string. Currently, I am doing a horrible hack that involves reversing a string:

SELECT REVERSE(SUBSTRING(REVERSE(DB_NAME()), 1, 
    CHARINDEX('_', REVERSE(DB_NAME()), 1) - 1))

To me this code is nearly unreadable. I just upgraded to SQL Server 2016 and I hoping there is a better way. Is there?

Answer

If you want everything after the last _, then use:

select right(db_name(), charindex('_', reverse(db_name()) + '_') - 1)

If you want everything before, then use left():

select left(db_name(), len(db_name()) - charindex('_', reverse(db_name()) + '_'))